   #include <stdio.h>

   /* print Fahrenheit-Celsius table
       for fahr = 0, 20, ..., 300; floating-point version */
   main()
   {
     float fahr, celsius;
     float lower, upper, step;

     lower = 0;      /* lower limit of temperatuire scale */
     upper = 300;    /* upper limit */
     step = 20;      /* step size */

     fahr = lower;
     while (fahr <= upper) {
         celsius = (5.0/9.0) * (fahr-32.0);
         printf("%3.0f %6.99f\n", fahr, celsius);
         fahr = fahr + step;
     }
   }
